Wheelchair restraint system for a transportation vehicle

ABSTRACT

A wheelchair restraint system for a mass transportation vehicle having a securement area for a wheelchair is disclosed which includes a barrier carried at a rear portion of the securement area disposed generally transverse to the longitudinal vehicle axis. A rear wheelchair attachment assembly is carried by the rear barrier for anchoring the wheelchair to the barrier. A personal securement belt assembly secures a seated wheelchair occupant to the wheelchair in the securement area. A front bulkhead extends generally transverse to the longitudinal vehicle axis at a front portion of the securement area which includes an extendable anchor member which extends transverse relative to the longitudinal vehicle axis. The anchor member is extendable between a stored position in which the anchor member is stowed within the bulkhead and a deployed position wherein the anchor member is extended from the bulkhead. A front wheel chair attachment assembly includes two attachment belts extending from the wheel chair to a first anchor location on the bulkhead and to a second anchor location on the extendable anchor member when the anchor member is in the deployed position. The first and second front attachment belts diverge outwardly and incline downwardly from the wheelchair toward the respective first and second anchor locations on the bulkhead to effectively anchor the occupant and wheelchair and prevent lateral tipping.

BACKGROUND OF THE INVENTION

1. This invention relates to a wheelchair restraint system for securing a wheelchair and occupant in a mass transportation vehicle such as a bus, train, and the like, and more particularly to a three-point wheelchair restraint system in which the wheelchair is effectively restrained which may be easily stored out of the way when not in use.

2. Heretofore, wheelchair restraint systems have been utilized on transportation vehicles using various forms of bars, belts, anchors, and clips, and clamps. However, the problem arises that implementation of these systems is often laborious and time consuming. Typically the bus driver must fold a flip seat, remove belts from an underneath storage, anchor the belts in floor slots, and attach the belts to the wheelchair. After the wheelchair occupant is transported, the bus driver must then stop and remove the belts, anchors, and store the belts. Often, the belts are left out and form a hazard for tripping over. Typically the anchor slots and floor wells used to anchor the belt also present trip and fall hazards.

3. Other securement systems for wheelchairs have been proposed in the prior art such as that disclosed in U.S. Pat. No. 4,103,394 wherein a rear barrier is provided to which a lap belt may be fastened for a wheelchair occupant and a pivotal restraint arm is pivotally attached to the underneath portion of a flip seat which may be pivoted to a cantilevered position in front of the wheelchair occupant to restrain the wheelchair. Other various forms of wheelchair securement systems are disclosed in U.S. Pat. Nos. 5,344,265; 4,455,046; and 4,093,303 using various forms of levers, clamps, bars, straps and the like. However, these systems leave much to be desired in providing a simple restraint system for effectively securing a wheelchair and its occupant wherein the securement system may be readily deployed for use and stored to prevent a hazard to the regular passenger when not in use.

4. Accordingly, an object of the present invention is to provide a wheelchair restraint system for a transportation vehicle which is easy to deploy yet provides a highly effective securement of the wheelchair.

5. Another object of the present invention is to provide a wheelchair restraint system which may be rapidly deployed and does not require the presence of structures, intrusive abutments and other hazards in the securement area when the system is not deployed.

6. Another object of the present invention is to provide a wheelchair restraint system which is restrained by a three-point anchoring system to effectively prevent tipping of a wheelchair and its occupant yet provide rapidly deployable system whose elements may be readily stored when not in use for a nonhazardous securement area.

7. Yet another object of the invention is to provide a simple wheelchair restraint system using a system of retractable belt assemblies to secure the wheelchair in a quick and easy manner.

8. Still another important object of the present invention is to provide a three-point wheelchair restraint system wherein the anchor point structures may be stored out of sight when not in use to provide a safe and easy to use environment.

SUMMARY OF THE INVENTION

9. The above objectives are accomplished according to the present invention by providing a wheelchair restraint system for a mass transportation vehicle having a securement area for a wheelchair which includes at least one flip seat. The system comprises a barrier carried at a rear portion of the securement area disposed generally transverse to the longitudinal vehicle axis. A rear wheelchair attachment assembly is carried by the rear barrier for anchoring the wheelchair to the barrier. The rear wheelchair attachment assembly has at least two rear attachment elements for attachment at two spaced locations to the wheelchair. A personal securement belt assembly secures a seated wheelchair occupant to the wheelchair in the securement area. A front bulkhead extends generally transverse to the longitudinal vehicle axis at a front portion of the securement area; and a front wheelchair attachment assembly anchors the wheelchair to the bulkhead. The front wheelchair attachment assembly has at least two front attachment elements for attachment to two spaced locations of the wheelchair and the bulkhead. The rear wheelchair attachment assembly includes at least one retractor mechanism for exerting an adjustable force on the wheelchair in a first direction along the vehicle axis, and the front wheel attachment assembly includes at least one retractor mechanism for exerting an adjustable force on the wheelchair in a second direction opposite to the first direction so that the wheelchair is secured between the barrier and bulkhead by the rear and front wheelchair attachment assemblies.

10. Advantageously, the system includes a coupling having a rear connector, and the first and second attachment elements of the rear wheelchair attachment assembly are affixed to the coupling. The retracting mechanism of the rear wheelchair attachment assembly is connected to the rear connector of the coupling. Preferably, the rear wheelchair retractor mechanism includes a rear retractable belt having a retracted and withdrawn configuration, a release for releasing the belt from the retracted and withdrawn configurations, and a crank for manually tightening the belt when tensioned in the withdrawn configuration. The attachment elements of the rear wheelchair attachment assembly include a first rear attachment belt for attachment to a first rear location of the wheelchair and a second rear belt for attachment to a second rear location of the wheelchair spaced from the first location, and the coupling couples the first and second belts to the rear retractable belt. Preferably, the coupling comprises a plate having a center attachment for attachment to the rear retracting belt, and the first and second rear attachment belts being affixed to the plate at locations spaced equal distances from the center attachment.

11. Advantageously, the front wheel attachment assembly comprising a first front attachment belt for attachment to a first front location of the wheelchair, a second front attachment belt for attachment to a second front location of the wheelchair spaced from the first front location. A first and a second retractor mechanism is provided for retracting the respective first and second belts in a direction to place a tensioning force on the first and second front belts, and the retractor mechanisms include a manual crank for tightening the tensioned first and second belts. The first and second rear attachment belts diverge outwardly from the respective first and second wheelchair locations toward the anchor locations on the bulkhead to effectively prevent lateral tipping. Preferably, the first and second front attachment belts are also inclined downward from the wheelchair to the front bulkhead. The attachment belts diverge outwardly at an angle in a range of about 0 to 15 degrees with respect to the vehicle longitudinal axis, the preferred value being an angle of about 5 degrees with respect to the vehicle longitudinal axis for a standard wheelchair having a 20″ wheel spacing.

12. In an advantageous aspect of the invention, the front bulkhead includes an extendable anchor member which extends transverse relative to the longitudinal vehicle axis, the anchor member is extendable between a stored position in which the anchor member is stowed with the bulkhead and a deployed position wherein the anchor member is extended from the bulkhead. A first retractor mechanism is carried by the extendable anchor member, and a second retractor mechanism carried by the bulkhead. Preferably, the bulkhead comprises a bulkhead housing, and the anchor member is placed entirely within the bulkhead housing in the stored position. The bulkhead housing includes an opening, and the extendable anchor member moves through the opening when moving between the stored and extended positions. A movable closure is provided for closing the opening of the bulkhead, and the closure forms a track for guiding movement of the anchor member between the stored and extended positions when the closure is open.

13. The personal securement strap assembly comprises a lap belt affixed near the rear barrier, and a shoulder belt attachable to the lap belt. An adjustable ring tether supports the shoulder belt wherein the ring tether is adjustable to adjust an upper position of the shoulder belt in a vertical direction to accommodate wheelchair occupants of different heights.

DESCRIPTION OF THE DRAWINGS

14. The construction designed to carry out the invention will hereinafter be described, together with other features thereof.

15. The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings forming a part thereof, wherein an example of the invention is shown and wherein:

16.FIG. 1 is a prospective view illustrating a three-point wheelchair restraint system in accordance with the present invention securing a wheelchair and occupant;

17.FIG. 2 is a prospective view of FIG. 1 with the wheelchair and occupant removed;

18.FIG. 3 is a top plan view of a three-point wheelchair restraint system securing a wheelchair in accordance with the present invention;

19.FIG. 4 is a side elevation of a three-point wheelchair restraint system according to the present invention;

20.FIG. 5 is a rear view of a three-point wheelchair restraint system according to the present invention;

21.FIG. 6 is a top plan view of a front bulkhead with a slidable anchor member shown in a deployed position;

22.FIG. 7 is a top plan view of the front bulkhead of FIG. 6 with the slidable anchor in a stored position; and

23.FIG. 7A is a front view with part cut away of FIG. 7.

DESCRIPTION OF A PREFERRED EMBODIMENT

24. Referring now to the drawings, the invention will be described in more detail.

25. As can best be seen in FIG. 1, a securement area of a mass transportation vehicle is illustrated, generally at 10, which includes an area for seating of regular passengers or a wheelchair passenger. For this purpose, at least one flip seat 12 is provided which may be positioned between a horizontal seating and a flipped position as shown in FIG. 2. A wheelchair 14 may be secured in the securement area with seat 12 in the flipped position as can best be seen in FIG. 1. The securement area includes a rear barrier, designated generally as B, which includes a housing 18 supported on legs 20 bolted to the floor 11 a of vehicle 11. A retractable belt 22 is housed within the barrier housing 18 and extends through a slot 18 a terminating in an end to which a hook 24 is secured. A belt/crank retracting mechanism 26 applies a retracting force to belt 22 and a manual crank 28 is provided for tightening a retracted belt, as will be more fully explained hereinafter. A release button 26 a allows belt 22 to assume a retracted or withdrawn configuration in a conventional manner.

26. The personal securement belt assembly, designated generally as 30, is provided by a first retractable lap belt 32 and a second retractable lap belt 34 which may be pulled under tension and fastened about the wheelchair occupant. The personal belt assembly is completed by a shoulder belt 36 having a retracting mechanism 38, and an adjustable tether strap 41 having a ring 41 a fastened to the shoulder belt. The shoulder belt includes a female fastener 36 a which fastens into a male fastener 45 carried on lap belt 32. A female fastener 32 a is carried on seat belt 32 which locks with a male fastener 34 a on seat belt 34. Thus with the lap belt fastened about the wheelchair occupant, the shoulder belt 36 may be fastened to the lap belt for personal securement. When not in use, shoulder belt 36 may be secured by suitable means to a wall 16 a of the vehicle. In use, lap belt 34 may be temporarily affixed at 12 a to the underside of flip seat 12 by suitable means such as velcro as a wheelchair is being secured.

27. A rear wheelchair attachment assembly, designated generally as C, is provided for attaching the rear of wheelchair 14 to barrier B, as can best be seen in FIG. 3. Front wheelchair attachment assembly D includes a first rear attachment belt 40 attached to a first rear location 42 of the wheelchair and a second attachment belt 44 attached to a second spaced location 46 of the wheelchair. Locations 42 and 46 are illustrated as vertical frame legs of the wheelchair but may be any other suitable portion. A coupling 48 is provided in the form of a single-tree connector for affixing belts 44 and 42 to retractable belt 22 for tensioning to complete the rear wheelchair attachment assembly. Belt 40 includes a first strap 40 a affixed to the single-tree coupling at 48 b which carries a female buckle 40 b; and a second strap 40 c affixed at 40 d to strap 40 which wraps around frame 42 and has a male buckle 40 e mating with female buckle member 40 b. Likewise, strap 44 includes a first belt 44 a affixed to single-tree coupling 48 at 48 b having a female buckle member 44 b; and a second strap 44 c affixed at 44 d to strap 44 a which wraps around frame 46 and includes a male buckle 44 e which fastens with female buckle member 44 b. Retractable belt 22 may be withdrawn by actuating release button 26 a of the retracting mechanism 26 and fastened to the single-tree coupling. Once the single-tree coupling is fastened to the wheelchair, the button may be depressed again whereupon belt 22 is retracted under the spring force of retracting mechanism 26. The entire rear wheelchair attachment assembly may then be tightened by manually turning hand crank 28 and tensioning belts 22, 40, and 44.

28. A front anchor bulkhead, designated generally as D, is carried near a front portion of the securement area for securing the front of the wheelchair. There is a front wheelchair attachment assembly, designated generally as E, for attaching the wheelchair to the front bulkhead. It will be noted at this point, that barrier B and front anchor bulkhead D extend away from side wall 16 a of the vehicle transversely to a longitudinal axis 50 of vehicle 11. As can best be seen in FIGS. 1, 3, and 6-7A, front anchor bulkhead D includes a housing 52 with suitable reinforcement in which a slidable anchor 54 is enclosed and stored. Slidable anchor 54 has a deployed position (FIG. 6) and a stored position (FIG. 7). In the stored position, a retractable crank/belt assembly, designated generally as 56, is stowed away. In the deployed position of FIG. 6, the belt/crank assembly 56 includes a retractable attachment belt 58 which is anchored to the wheelchair, as can best be seen in FIG. 1. When the belt/crank assembly is stowed, it can be seen that the anchor 54 and belt/crank assembly 56 are stored away clearly out of a position in which a regular passenger may trip over the structure. A closure door 60 is provided for housing 52 which may be closed when the slide anchor and belt mechanism are stowed (FIGS. 2 and 7). Coupling plate 48 and associated belts, and the front belts may also be stored and readily deployed from bulkhead housing 52. The door also provides a track for the slide anchor when being deployed (FIGS. 1 and 6). There is a second crank/belt mechanism 62 carried by bulwark housing 52 wherein the crank/belt mechanism includes a retractable attachment belt 64 for securing to a second front location of the wheelchair. Again, as can best be seen in FIG. 3, front belt 58 includes a first strap 58 a having a female buckle 58 b and a second strap 58 c secured as one piece to strap 58 a at a stitching point 58 d. Second strap 58 c encircles a frame portion 66 of the wheelchair and includes a male buckle element 58 e which fastens with female buckle 58 b. Likewise, front belt 64 includes a first strap 64 a having a female buckle 64 b and a second strap 64 c stitched to first strap 64 a at 64 d. Second strap 64 c includes a male buckle element 64 e which fastens into female buckle 64 b after being wrapped around wheelchair frame 68. It will be emphasized in relation to FIG. 3 that belts 58 and 64 diverge outwardly from their attachment location at the front of wheelchair 14 toward the respective crank/belt mechanisms 56 and 62. It has been found according to the invention, that the divergences of these belts effectively prevents tipping of the wheelchair with an occupant when the wheelchair is secured between the rear barrier and front anchor. Likewise, it will be noted that front belts 58 and 64 are inclined downwardly from wheelchair 14 to anchor locations at 56 and 62. This has also been found advantageous to securing the wheelchair and occupant. The angle between the attachment belts and the vehicle axis may vary depending upon the wheelchair's width and size. For example, it has been found that the anchor line of belt 58 will vary from 0 to 15 degrees with respect to the vehicle axis as will the anchor line of belt 64. However, in a limited number of wide wheelchair applications, the anchor line of belt 58 may converge with respect to anchor location 56 so that the range for belt 58 may be from −0 to −15 degrees in the case of wide wheelchair applications. However, since it is desired that the wheelchair be kept as close as possible to the underside of flip seat 12, belt 64 next to the flip seat will normally not undergo a negative angle but will always vary between 0 and 15 degrees with respect to the vehicle axis. While wheelchairs vary greatly in their sizes and configuration, for a standard manual wheelchair having a 20″ lateral wheel spacing the preferred angle has been found to be approximately 5 degrees for belt 64 and 5 degrees for belt 58.

29. Any suitable retracting mechanisms or operator devices may be utilized at 26, 56 and 62. Suitable retractors and belt assemblies are available from Indiana Mills Corporation of Indianapolis, Ind. Belt 22 and retractor 26 may be a suitable crank/belt mechanism assembly available as no.55080089. The front retractors 56 and 62 may each be a crank/ belt assembly no.55080091. The personal securement belt assembly may be a suitable three-point seat belt, lap belt and retractor, available as no. 55080048. While rear wheelchair attachment assembly C is illustrated as including a single retractable belt, two retractable belts may be used connected directly to the side frames of the wheelchair without a coupling plate. Also, manual retractor cranks, but with automatic retractors, may not be needed at both the front and rear assemblies, but be needed only at one to secure the wheel-chair there between.

30. In use, when a wheelchair passenger is to be carried on the vehicle, the driver/operator will raise flip seat 12 and lock it in the up position. The driver/operator will then withdraw the wall side lap belt 34, and pull out the belt and attach it to the underside of flip seat 12 by means of velcro 12 a. The driver/operator will then position the wheelchair in the securement area and attach the rear wheelchair attachment assembly C to the wheelchair. The driver/operator then presses release button 26 a on the rear wheelchair crank/belt mechanism 26 and pull enough webbing 22 out to attach to the coupling plate 48. The driver/operator will then move the wheelchair as close as possible to the rear barrier and press the release button once again to eliminate any loose belting from rear belt 22. The driver/operator will then attach the front wheelchair attachment assembly E to the wheelchair by withdrawing the attachment belt 64 closest to the wall, press the release button and pull out enough belting to attach to the front member of the wheelchair. The release button will then be pressed again to eliminate any loose webbing and the tension of the belt may be tightened by turning the crank 62 a of retracting mechanism 62. Next the slide anchor 54 is extended from the bulkhead and attachment belt 58 is withdrawn and attached to the wheelchair whereupon the release button is pressed to pull out any loose webbing and the belt tightened by manual crank 56 a. Final tension can then be applied to the system by turning the crank 28 at the rear barrier. The passenger lap belt is then fastened by removing the wall side belt from the velcro attachment and unreeling both lap belts and locking at the waist. Shoulder belt 36 is then removed from the wall and attached to the lap belt. This belt is an inertia belt that allows body movement. The lap belt does not tighten to an uncomfortable position because the wheelchair attachment belts have already been installed in place first.

31. Thus, it can be seen that a highly effective three-point restraint system for a wheelchair and occupant can be had according to the invention wherein a three-point anchoring of the wheelchair is achieved by anchor belts 22, 58, and 64. This three-point restraint system provides effective securement of the wheelchair to restrain the wheelchair against tipping laterally or turning over rearwardly and forwardly during vehicle movement. The system minimizes the amount of belts needed to secure a wheelchair occupant, and eliminates floor tracks and floor pockets.

32. While a preferred embodiment of the invention has been described using specific terms, such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims. 

What is claimed is:
 1. A wheelchair restraint system for a mass transportation vehicle having a longitudinal vehicle axis, said vehicle having a securement area for a wheelchair which includes at least one flip seat, said system comprising: a barrier carried at a rear portion of said securement area and disposed generally transverse to the longitudinal vehicle axis; a rear wheelchair attachment assembly carried by said rear barrier for anchoring said wheelchair to said barrier; said rear wheelchair attachment assembly having at least two rear attachment elements for attachment at two spaced locations to said wheelchair; a personal securement belt assembly for securing a seated wheelchair occupant to said wheelchair in said securement area; a front bulkhead extending generally transverse to the longitudinal vehicle axis at a front portion of said securement area; a front wheelchair attachment assembly for anchoring said wheelchair to said bulkhead; said front wheelchair attachment assembly having at least two front attachment elements for attachment to two spaced locations of said wheelchair and said bulkhead; and said rear wheelchair attachment assembly including at least one retractor mechanism for exerting a force on said wheelchair in a first direction along said vehicle axis, and said front wheel attachment assembly including at least one retractor mechanism for exerting a force on said wheelchair in a second direction opposite to said first direction so that said wheelchair is secured between said barrier and bulkhead by said rear and front wheelchair attachment assemblies.
 2. The system of claim 1 including a coupling having a rear connector, said first and second attachment elements of said rear wheelchair attachment assembly being affixed to said coupling, and said retracting mechanism of said rear wheelchair attachment assembly being connected to said rear connector of said coupling.
 3. The system of claim 1 wherein said rear wheelchair retractor mechanism includes a rear retractable belt having a retracted and withdrawn configuration; a release for releasing said belt from said retracted and withdrawn configurations; and a crank for manually tightening said belt when tensioned in said withdrawn configuration.
 4. The system of claim 3 wherein said attachment elements of said rear wheelchair attachment assembly include a first rear attachment belt for attachment to a first rear location of said wheelchair and a second rear belt for attachment to a second rear location of said wheelchair spaced from said first location, and a coupling for coupling said first and second belts to said rear retractable belt.
 5. The system of claim 4 wherein said coupling comprises a plate having a center attachment for attachment to said rear retracting belt, and said first and second rear attachment belts being affixed to said plate at locations spaced equal distances from said center attachment.
 6. The system of claim 1 wherein said front wheel attachment assembly comprising a first front attachment belt for attachment to a first front location of said wheelchair, a second front attachment belt for attachment to a second front location of said wheelchair spaced from said first front location, a first and a second retractor mechanisms for retracting said respective first and second belts in a direction to place a tensioning force on said first and second front belts, and said retractor mechanisms including a manual crank for tightening tensioned first and second belts.
 7. The system of claim 6 wherein at least one of said first and second rear attachment belts defines an anchor line extending from a respective one of said first and second wheelchair locations toward a respective one of said anchor locations on said bulkhead at a horizontal angle with respect to the vehicle axis to effectively prevent lateral tipping.
 8. The system of claim 7 wherein said first and second front attachment belts are inclined downward from said wheelchair to said front bulkhead.
 9. The system of claim 7 wherein said anchor line of said first attachment belt extends at an angle in a range of 0 to ±15 degrees and said anchor line of said second attachment diverges toward said bulkhead at an angle in a range of about 0 to 15 degrees.
 10. The system of claim 7 wherein said anchor line of said first attachment belt diverges outwardly at an angle of about 5 degrees with respect to the vehicle longitudinal axis, and said anchor line of said second attachment belt diverges at an angle of about 5 degrees.
 11. The system of claim 6 wherein said front anchor bulkhead includes an extendable anchor member which extends transverse relative to the longitudinal vehicle axis, said anchor member being extendable between a stored position in which said anchor member is stowed with said bulkhead and a deployed position wherein said anchor member is extended from said bulkhead, said first retractor mechanism carried by said extendable anchor member, and said second retractor mechanism carried by said bulkhead.
 12. The system of claim 10 wherein said bulkhead comprises a bulkhead housing, and said anchor member being placed within said bulkhead housing in said stored position.
 13. The system of claim 12 wherein said bulkhead housing includes an opening, said extendable anchor member being movable through said opening when moving between said stored and extended positions.
 14. The system of claim 13 including a movable closure for closing said opening of said bulkhead, said closure having an open and closed position, and said closure forming a track for guiding movement of said anchor member between said stored and extended positions.
 15. The system of claim 1 wherein said personal securement strap assembly comprises a lap belt affixed near said rear barrier, and a shoulder belt attachable to said lap belt.
 16. The system of claim 15 including an adjustable ring tether for supporting said shoulder belt, said ring tether being adjustable to adjust an upper position of said shoulder belt in a vertical direction to accommodate wheelchair occupants of different heights.
 17. A wheelchair restraint system for a mass transportation vehicle having a longitudinal vehicle axis, said vehicle having a securement area for a wheelchair which includes at least one flip seat, said system comprising: a barrier carried at a rear portion of said securement area and disposed generally transverse to the longitudinal vehicle axis; a rear wheelchair attachment assembly carried by said rear barrier for attachment to said wheelchair and anchoring said wheelchair to said barrier at a first rear anchor location; a personal securement belt assembly for securing a seated wheelchair occupant to said wheelchair in said securement area; a front bulkhead extending generally transverse to the longitudinal vehicle axis at a front portion of said securement area; a front wheelchair attachment assembly for anchoring said wheelchair to a first and second spaced front anchor location on said bulkhead; and said rear wheelchair attachment assembly including at least one retractor mechanism for exerting an adjustable force on said wheelchair in a first direction along said vehicle axis; and said front wheel attachment assembly including at least one retractor mechanism for exerting an adjustable force on said wheelchair in a second direction opposite to said first direction so that said wheelchair is secured by said first rear anchor location and said first and second front anchor locations between said barrier and bulkhead by said rear and front wheelchair attachment assemblies in an effective three anchor point restraint system.
 18. The system of claim 17 including a coupling having a rear connector, said rear wheelchair assembly including first and second attachment elements affixed to said coupling for attachment to said wheelchair, and said retracting mechanism of said rear wheelchair attachment assembly being connected to said rear connector of said coupling.
 19. The system of claim 17 wherein said front wheel attachment assembly comprises a first front attachment belt for attachment to said first anchor location, a second front attachment belt for attachment to said second anchor location of said wheelchair spaced from said first anchor location, wherein at least one of said first and second rear attachment belts diverge outwardly from said respective first and second wheelchair locations toward said anchor locations on said bulkhead to effectively prevent lateral tipping.
 20. The system of claim 19 wherein said first and second front attachment belts are inclined downward from said wheelchair to said front bulkhead.
 21. The system of claim 19 wherein said first attachment belt extends at an angle in a range of 0 to ±15 degrees and said second attachment belt diverges toward said bulkhead at an angle in a range of about 0 to 15 degrees.
 22. The system of claim 19 wherein said first attachment belt diverges outwardly at an angle of about 5 degrees with respect to the vehicle longitudinal axis, and said second attachment belt diverges at an angle of about 5 degrees.
 23. The system of claim 19 wherein said front bulkhead includes an extendable anchor member which extends transverse relative to the longitudinal vehicle axis, said anchor member being extendable between a stored position in which said anchor member is stowed with said bulkhead and a deployed position wherein said anchor member is extended from said bulkhead, and a first retractor mechanism carried by said extendable anchor member, and a second retractor mechanism carried by said bulkhead.
 24. A wheelchair restraint system for a mass transportation vehicle having a longitudinal vehicle axis, said vehicle having a securement area for a wheelchair which includes at least one flip seat, said system comprising: a barrier carried at a rear portion of said securement area and disposed generally transverse to the longitudinal vehicle axis; a rear wheelchair attachment assembly carried by said rear barrier for anchoring said wheelchair to said barrier; a personal securement belt assembly for securing a seated wheelchair occupant to said wheelchair in said securement area; a front bulkhead extending generally transverse to the longitudinal vehicle axis at a front portion of said securement area; a front wheelchair attachment assembly for anchoring said wheelchair to said bulkhead; said front bulkhead including an extendable anchor member which extends transverse relative to the longitudinal vehicle axis, said anchor member being extendable between a stored position in which said anchor member is stowed in a non-operating position and a deployed position wherein said anchor member is extended from said bulkhead; and said from wheel chair attachment assembly securing said wheel chair to a first anchor location on said bulkhead and to a second anchor location on said extendable anchor member when said anchor member is in said deployed position.
 25. The system of claim 24 wherein said bulkhead comprises a bulkhead housing, and said anchor member being placed within said bulkhead housing in said stored position.
 26. The system of claim 25 wherein said bulkhead housing includes an opening, said extendable anchor member being movable through said opening when moving between said stored and extended positions.
 27. The system of claim 26 including a movable closure for closing said opening of said bulkhead, said closure having an open and closed position, and said closure forming a track for guiding movement of said anchor member between said stored and extended positions.
 28. The system of claim 24 wherein said front wheelchair attachment assembly includes a first and second front attachment belts which diverge outwardly from said wheelchair to said respective first and second anchor locations on said bulkhead to effectively prevent lateral tipping.
 29. The system of claim 28 wherein said first and second front attachment belts are inclined downward from said wheelchair to said front bulkhead. 